JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry Question Bank Atomic Molecular and Equivalent masses

  • question_answer \[12g\]of \[Mg\](at. mass 24) on reacting completely with acid gives hydrogen gas, the volume of which at STP would be [CPMT 1978]

    A)                 \[22.4\ L\]              

    B)                 \[11.2\ L\]

    C)                 \[44.8\ L\]              

    D)                 \[6.1\ L\]

    Correct Answer: B

    Solution :

               \[Mg+2HCl\to MgC{{l}_{2}}+{{H}_{2}}\] \[\because \]   24g Mg evolves 22.4L \[{{H}_{2}}\]at STP                    \[\therefore \]   12g Mg evolves \[{{H}_{2}}\]at STP \[\frac{22.4}{24}\times 12\]                                                                                   =11.2L at STP.

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